Same here. Actually, I didn't think of it as a "proof" service, I was thinking that bits of positive human interaction ("invisible friend") provide a lot of em

Same here. Actually, I didn't think of it as a "proof" service, I was thinking that bits of positive human interaction ("invisible friend") provide a lot of emotional value, and you could crowd-source a text conversation with a fake friend, modulo quality control, and people would pay for it.